MDL-62907 Logging: remove plugin interdependencies

- Move decode_other() from standard to tool_log\helper\reader trait.
- Change all ocurrences to "use" the trait method. But a unit test.
- Duplicate the admin lang strings in database and use them.
- An incorrect phpdoc @Package.

admin/tool/log/classes/helper/reader.php

@@ -62,6 +62,25 @@ public function get_description() {
         return $this->store;
     }
 
+    /**
+     * Function decodes the other field into an array using either PHP serialisation or JSON.
+     *
+     * Note that this does not rely on the config setting, it supports both formats, so you can
+     * use it for data before/after making a change to the config setting.
+     *
+     * The return value is usually an array but it can also be null or a boolean or something.
+     *
+     * @param string $other Other value
+     * @return mixed Decoded value
+     */
+    public static function decode_other(string $other) {
+        if ($other === 'N;' || preg_match('~^.:~', $other)) {
+            return unserialize($other);
+        } else {
+            return json_decode($other, true);
+        }
+    }
+
     /**
      * Adds ID column to $sort to make sure events from one request
      * within 1 second are returned in the same order.

admin/tool/log/classes/local/privacy/helper.php

@@ -37,6 +37,7 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class helper {
+    use \tool_log\helper\reader;
 
     /**
      * Returns an event from a standard record.
@@ -49,7 +50,7 @@ protected static function restore_event_from_standard_record($data) {
         $extra = ['origin' => $data->origin, 'ip' => $data->ip, 'realuserid' => $data->realuserid];
         $data = (array) $data;
         $id = $data['id'];
-        $data['other'] = \logstore_standard\log\store::decode_other($data['other']);
+        $data['other'] = self::decode_other($data['other']);
         if ($data['other'] === false) {
             $data['other'] = [];
         }

admin/tool/log/store/database/classes/log/store.php

@@ -226,7 +226,7 @@ public function get_log_event($data) {
         $extra = array('origin' => $data->origin, 'ip' => $data->ip, 'realuserid' => $data->realuserid);
         $data = (array)$data;
         $id = $data['id'];
-        $data['other'] = \logstore_standard\log\store::decode_other($data['other']);
+        $data['other'] = self::decode_other($data['other']);
         if ($data['other'] === false) {
             $data['other'] = array();
         }

admin/tool/log/store/database/lang/en/logstore_database.php

@@ -39,6 +39,8 @@
 $string['includelevels'] = 'Include actions with these educational levels';
 $string['filters'] = 'Filter logs';
 $string['filters_help'] = 'Enable filters that exclude some actions from being logged.';
+$string['jsonformat'] = 'JSON format';
+$string['jsonformat_desc'] = 'Use standard JSON format instead of PHP serialised data in the \'other\' database field.';
 $string['logguests'] = 'Log guest actions';
 $string['other'] = 'Other';
 $string['participating'] = 'Participating';

admin/tool/log/store/database/settings.php

@@ -60,8 +60,8 @@
         'logstore_database'), get_string('buffersize_help', 'logstore_database'), 50));
 
     $settings->add(new admin_setting_configcheckbox('logstore_database/jsonformat',
-            new lang_string('jsonformat', 'logstore_standard'),
-            new lang_string('jsonformat_desc', 'logstore_standard'), 1));
+            new lang_string('jsonformat', 'logstore_database'),
+            new lang_string('jsonformat_desc', 'logstore_database'), 1));
 
     // Filters.
     $settings->add(new admin_setting_heading('filters', get_string('filters', 'logstore_database'), get_string('filters_help',

admin/tool/log/store/database/version.php

@@ -17,7 +17,7 @@
 /**
  * External database log store.
  *
- * @package    logstore_standard
+ * @package    logstore_database
  * @copyright  2013 Petr Skoda {@link http://skodak.org}
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */

admin/tool/log/store/standard/classes/log/store.php

@@ -112,25 +112,6 @@ public function get_events_select_iterator($selectwhere, array $params, $sort, $
         return new \core\dml\recordset_walk($recordset, array($this, 'get_log_event'));
     }
 
-    /**
-     * Function decodes the other field into an array using either PHP serialisation or JSON.
-     *
-     * Note that this does not rely on the config setting, it supports both formats, so you can
-     * use it for data before/after making a change to the config setting.
-     *
-     * The return value is usually an array but it can also be null or a boolean or something.
-     *
-     * @param string $other Other value
-     * @return mixed Decoded value
-     */
-    public static function decode_other(string $other) {
-        if ($other === 'N;' || preg_match('~^.:~', $other)) {
-            return unserialize($other);
-        } else {
-            return json_decode($other, true);
-        }
-    }
-
     /**
      * Returns an event from the log data.
      *